1. K. Galloway, A. Mann andR. Weiner:Mesonic structure in the nucleon, to be published.
2. L. Landau:Journ. Phys. USSR,5, 71 (1941);11, 91 (1947); a Lorentz-invariant derivation of this condition is given in ref.
3. A. Mann andR. M. Weiner:Superfluidity of hadronic matter, to be published.
4. R. Hagedorn:Suppl. Nuovo Cimento,3, 147 (1965);Nuovo Cimento,56 A, 1027 (1968);Suppl. Nuovo Cimento,6, 311 (1968).
5. K. Imaeda:Lett. Nuovo Cimento,1, 290 (1971).